土压平衡盾构机下穿既有地铁线路施工技术控制要点

Key Points of Construction Technology for Earth Pressure Balanced Shield Tunneling under Existing Metro Line

近年来,全国城市轨道交通快速发展,大面积应用盾构法施工,涉及到盾构下穿运营线路也越来越多,如何控制好盾构掘进下穿既有线是盾构施工控制难点与重点。结合广州轨道交通七号线一期土压平衡盾构机下穿运营三号线,从现场监测的数据分析等方面总结归纳地铁下穿既有线路的关键点及其相应的控制措施,避免施工出现施工事故。

In China,as the rapid development of urban rail transit,the technique of shield tunneling is widely used in recent years. The situation that the shield passes under the existing metro line becomes more frequent. In that case,how to control the shield tunneling when shield passes under the existing metro line,which is the difficulty and the key point. This paper combines the case of shield tunneling under the interval of Line 3 during the construction period of the first phase of Guangzhou Metro Line 7. According to the on-site monitoring data,the key point and corresponding control measure for the case of shield tunneling under the existing metro line are concluded in order to avoid the accident during cosntrction.